Too passive on this river?

[AdamL]

My check-raise failed on the turn and I had no idea what buddy was raising me with on the river. I think I should have re-raised him but would like to confirm that.

Party Poker 3/6 Hold'em (9 handed)
converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is SB with T/images/graemlins/spade.gif, 7/images/graemlins/spade.gif. CO posts a blind of $4.
<font color="666666">1 fold</font>, UTG+1 calls, <font color="666666">1 fold</font>, MP2 calls, MP3 calls, CO (poster) checks, <font color="666666">1 fold</font>, Hero completes, BB checks.

Flop: (6.33 SB) K/images/graemlins/spade.gif, 8/images/graemlins/heart.gif, 3/images/graemlins/spade.gif <font color="blue">(6 players)</font>
Hero checks, BB checks, <font color="CC3333">UTG+1 bets</font>, MP2 calls, MP3 folds, CO folds, Hero calls, BB folds.

Turn: (4.66 BB) 5/images/graemlins/spade.gif <font color="blue">(3 players)</font>
Hero checks, UTG+1 checks, MP2 checks.

River: (4.66 BB) 2/images/graemlins/diamond.gif <font color="blue">(3 players)</font>
<font color="CC3333">Hero bets</font>, <font color="CC3333">UTG+1 raises</font>, MP2 folds, Hero calls.

Final Pot: 8.66 BB
<font color="green">Main Pot: 8.66 BB, between Hero and UTG+1.</font>

[lil']

3 bet the river.

[afk]

3 bet the river